Warm-air furnace



Feb. 4, 1930. R. w. s'rocKwELL WARM AIR FURNACE 5 Sheets-Sheet Filed Jan. 20. 1928 WMW w n "Feb. 4, 1930. R. w. STQCKWELL WARM- AIR FURNACE Filed Jan. 20. 1928 5 Sheets-Sheet 2 Feb. 4, 1930.

. R. W. STOCKWELL WARM AIR FURNACE Filed Jan. 20. 1928 5 Sheets-Sheet 3 Patent d Feb. 4, 1 930 PATEN mcL-EY PH w. s'rocKwEi'iL, 0F 'WEBS'I'ER enovns, MISSOURI, ASSIGNOR' TQLANGENBERG Y MANUFAGEURING 00., or ST; LOUIS, MISSOURI, A coRroaATIon OFI'MISSOUR-II WARM-AIR FURNACE I I I 5pp1ication filedrqanuary 20, 1 928. Serial we, 243,037. 7

-. Thisinvention relates to improvements in a air furnaces,;a nd consists in th'e'novel construction hereinafter described.

An ob'ct of the i' ventionis' to provideja Warm air furnace including a primary heating; drum connected with a pair of heating o drums having therein a,,tortuoi 1s gas passage ires ulting inan extended travel of the heated gases from the. top of. the primary heating drum through the pair of auxiliary drums,

- the gas leaving the furnace at' a point near tended'heat radiating surface. 7

the bottom thereof, thereby providing an. ex-

,' ,Another object of thenvention to pro- .vide a construction ofthe type described in which the temperaturej'in the area 'ojtthe warm air outlet fluesis 'substantiallyequal izedJ- v j A nother object of the iiiventionl isfto ,vide a construction ofthe type described in which heat radiating surfaces are substantially vertical and inwhich' the free air areas are approximately equal in width, thereby obtaining a=m0re perfect heat radiation, and

also a reduction] of stratification andeddy movements of the air coming in contact with the heatingsur-faces.

I Another object of the invention is to pro- I vide' in a type of construction above -men tioned sufiiciently large passes for the gas I generated in the primary combustion chamber, particularly where the fuel is oilvapor or gas, toprevent ,an' external explosion of he 'gas by accommodating the initial expan- Additional objects of the anaemi -a1] 'be apparent from the following detailed de scription taken in connection with the accompanying drawings, in whichjjo p I tical sectionthrough the furv p w are spaced from the primary dru mland also Fig. 1 is a ver nace' substantially'onthe line 1-'.1of Fig.2.

.l 'trated in the. drawings, the invention comthefurnace. 1

V lnythe embodiment of the invention'illusprisef s anIoutershell lwhich is substantially ovalin cross section and is designed to-house the primary and secondary drums-through brick' or other refractorylining 12.

thefheate'd gas passes. shell is mounted upon a base 2 and is provided with a c'oldfair inlet '3vnearthej bottom thereof and apluralityof warm air. outlet'fiues 4 arranged at spaced intervals around the circumference of the. shell near the top. The shell is closed by atop wall 5'. f i a the combustion chamber being provided through'a door 9 closing an opening through I the shell, and access to the chamber 8 being glnthe forward partfof thesjhell is the pri- 'm ary heating drumrwhich comprises a'cylindricall casing '6 divided intoga combustion chamberffan'da draft chamberQS, accessto v I tion of the chamber"? maybelined with fire It is to be und'erstoo dv that the construction isjprimarily designed for the use: of oilor ga I as a'fuehalth llgh itisnot to belirnitedlto,

like, byproviding suitable forced clraft" in accordance with well known practices.

vapororgliquid fuel-asit isfapplicable also. o to the use ofcoal, coke,pow dered fuel or theing drum is a pair of secondary drums each comprising an outer wall 13 and-an inner wall 14, said two drumsbeing arranged in parallel relationship and'the' walls being so spaced as I to form oval rings; with a1r passages 515 through the"fcenter1the1'eof.T, Within each of the secondary drums'arebafies IG'eXtending outwardly and bafiles '17. extendinginwardly in different horizontal planes from' the V It willbe noted thatthe :secondarydrums from the casing 1 so that the intervening bafiies 16 thereby providingin the secondary drumsa tortuousgaspassagehaving a sub- 7 stantialcross area-g spaces externallyiof said secondary, drums and the internalfspaces withinthe' drums are of approximately the. same area; It will be 7 noted also that thefside wfillsiofthe primary and secondary drumsfare substantiallywer I 'tical, avoiding any irregularities so thatpassage Ofthe air from the bottomfofthef shell f in e ac L h s wiyli ii 5% passage of the gas from the top to the bottom portion of said secondary drums. The lower passes of'each of the secondary drums is connected with an outlet flue 19, which fines form a Y-connection with the stack 20.

Each of the secondary drums also may be provided with spaced passages 21 that extend outwardly through the shell 1, the ends of which are closed by flapva'lves 22, thus providing means of access forcleaning the secondary drums and also as safety devices that; open outx'v'ardly in event of: excessive pressure being generated in the secondary drums by an explosionof gas therein. I

It will be noted that the secondary dr ms are supported on frames 23 at an elevation above the base of the shell 1 to provide a cold air area at the bottomof the shell, which air passes upwardly in co nt rcurrent to the heated gas within the secondary drums.

From the fore oing description it will be observed that the construction afiords a large heat radiating surface and a long gas travel, and that the hot gases enter at the top of the secondary drums and discharge at the bottom thereof. This downward movement of the hot gases tends to prevent stratification thereof and also'stratification of the air passing externally of the heating surfaces andpre- Xvents a back passage of the hot air into the air intake pipe. Since the cold air enters at the bottom of the secondary drums and passes upwardly encountering the cooler portion of the secondary drums first, a countercurrent flow of the heating gases and the air being heated economizes in heat transfer and effects a substantial saving of heat units.

Furthermore, the warmed air reaching the top of the shell 1 is uniformly distributed in the areaof the warm air ontlet flues, thereby providing for an equal distribution of the warm air leader pipes connected into said ne Therefore, it is apparent thatfthe consanction greatly improves the efficiency of Warm air heating furnaces of the type mentioned, and fully accomplishes the objects hereinbefore set out, am aware that. the

invention may be modified innumerous particulars without departing from the spirit and scope there0f.- I do not limit myself 7 unessentially, but what I claim and desire to secure by Letters Patent is t 1. A warm air furnace comprising an outer vertical horizontally oblong wall enclosing a horizontally oblong space and having an air inlet opening near its lower end and warm air outlet openings near its upper end, a combined combustion chamber and heating drum enclosed by said wall nearthe wall thereof at one end of said space, twovertical O-shaped walls forming between them an Q-Shaped space and enclosed by said first wall between said primary heating drum and the opposite enclofsaid first wall, a pipe opening from said primary heating drum into theyupper end of'said Q-shap'ed space, a U-shaped wall closing said space below said pipe and leaving the opposite curved end of said O-shaped space vertically-open, a

second U-shaped wan'below the plane of said first U-shaped wall closing the outer end of said U-shaped space and leaving olen the inner end of said U-shaped space be ow said 7 first U-shaped wall, and s ips openi'ngfrom the end of said O sh'apecl.- space below said second U-shaped wall.

2; A warm air' furnace comprisin an out-er vertical horizontally oblong wall enclosing a horizontally oblongspace having an air inlet openin near its lower end and Warm air outlet openings'near its upper end, a combined combustion chamber and primary heating drum enclosed by said wall near one end of said space, two vertical horizontally oblong walls enclosedby' said first wall and forming secondary heating drums between said combustion chamber and the opposite end of said space, an inner vertiioo cal oblong wall in and spaced'froin each of said walls of said secondary heating drums and forming air passages 'openingat their upper and lower ends into said space enclosed by said outer wall and forming vertical 0- shaped'space's in said secondary heating drums, a pipe from Said primary heating drum opening into the upper portion of each :of said spaces, a horizontal U-shaped baffle wail inandclosing each of said s a es beill) low said pipe contiiniously for a distance" along each side of said inner oblong wall toward the outer end of said space and leaving vertically open the outer horizontally curved portion of said space, a second horizontal U-shaped bafiie-Wa-ll in and closing the outer portion of each of said spaces below said open space at the outer end of said first baffle wall and toward the Walldf said,

secondary drum through which. said pipe opens and leaving vertically open the inner horizontally curved portion of said space for the downward passage of products; of combustion, and an outletipi e openingfrom said Outer-secondary drum be ow said second baille Wall. r

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